morison



(No Model.) 3Sheets-Sheet 1.

'B. MORISON. STEAM BOILER OR OTHER FURNACE.

No. 518,762. Patented Apr. 24, 1894.

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D. B. MORISON. STEAM BOILER OR OTHER FURNAGE.

3 Sheets-Sheet 2.

(No Model.)

No. 518,762. Patented Apr. 24, 1894.

o oo-oo flu em? I STEAM BOILER OR OTHER FURNACE.

Patented Apr. 24, 1894.

I No. 518,762.

'jm miar 'UNITED STATES PATENT I OFFICE.

DONALD BARNS MORISON, OF HARTLEPOOL, ENGLAND.

STEAM-BOILER OR- OTHER FURNACE.

SPECIFICATION forming part of Letters Patent No. 518,762, dated April.24,1894. I

Application filed June 8, 1893. Serial No.476,947. (No model.)

['0 aZZ whom it may concern:

Be it known that I, DONALD BARNS-MORI- SON, a subject of the Queen ofGreat Britain and Ireland, residing at Hartlepool, in the county ofDurham, England, have invented Improvements in or RelatingtoSteam-Boiler or other Furnaces, of which the following is aspecification.

This invention has reference to improvej when such accumulation occurs,and also to give greater facilities for stoking. To this end I remove aportion of the dead plateimmediately inside the furnace door so as toleave a recess or gap and I construct the door with an inward extensionor ledge which when the door is closed, fills the said recess or gap,The said extensionor ledge may be formed in one with or be secured tothe door, and may be perforated and have aperforated baffle plate forthe admission of air to the furnace in the same way as the vertical partof the door.

In the accompanying drawings, Figure 1 is a front elevation; Fig. 2 ahorizontal section on the line a: m Fig. l; and Fig. 3 a verticalsection on the line y y Fig. 1, showing afurnace front with double doorsconstructed according to this invention, the doors being arranged to,turn on a horizontal axis. Figs. 4, 5 and 6 are corresponding views ofthe front part of a furnace having a single door mounted in the same wayas that shown in Figs. 1, 2 and 3. Figs. 7, 8 and 9 are alsocorresponding views the furnace in this case having asingle doorturning'on a vertical axis.

The same letters indicate corresponding,

parts in all the figures. 1

A represents the furnace front plate fitted with an ordinary internalbaffle plate A.

Bis the dead plate in the front part of which according co-thisinvention is formed one or more recesses G 0 according to the number offire doors with which the furnace front is provided.

D D are the furnace doors the lower end of each of which is formed withan inwardly projecting horizontal extension or ledge E hereinaftercalled an extension that fits the corresponding recess 0 in the deadplate B, and a corresponding extension'E' is formed on the baffle plateD inside and above the said extension E. The lower inner edge of thisextension E fits under the inner edge of the recess 0 as indicated moreclearly in the vertical section shown in Figs. 3, 6 and 9 so as toeffectually close the recess into which the said extensions enter.

In the arrangements illustrated in Figs. 1 2, 3, 4, 5 and 6, wherein thedoors turn up and down on horizontal axes, the doors are placed betweencheeks F riveted or otherwise secured to the furnace front A and baffleplate A, and are balanced by weights G, in the ordinary way. In thearrangement shown in Figs. 7, 8 and 9 in which the door is hinged toturn about a vertical axis, the cheeks F are of course unnecessary. Thearrangement with double doors Figs. 1, 2 and 3 may advantageously beused for furnaces of large diameter.

By either of the constructions of furnace described it will be seen thatit is practically impossible for the fireman to leave a mass of burningfuel heaped up against the baffle plate of the fire door, as frequentlyoccurs with furnaces as heretofore generally constructed with the frontedge of the dead plate opposite the door flush with the furnace frontplate. Thus the burning away of the baffle plates attached to the doorsis obviated and this being a frequent source of expense, it follows thata considerable economy will result from the adoption of the constructionits closed position, to close said recess substantially as hereindescribed for the purpose specified.

2. A furnace constructed with a recessed dead plate and with a doorhaving an inward extension adapted to close the recess in said deadplate for the purpose specified.

3. A furnace constructed with a recessed dead plate, and with a doorhaving an inward extension adapted to close the recess in said deadplate, and having a corresponding extension on its baffie platesubstantially as described for the purpose specified.

4. In a furnace the combination of a dead plate formed with a recess 0,and a door having at its lower part an inward extension adapted to fitsaid recess substantially as described.

5. The combination with a furnace front plate of a dead plate formedwith a recess 0 opposite the fire door opening in said front plate, adoor havinga lower inward extension E, and a baffie plate secured to theinner side of said door and formed with a corresponding inward extensionE substantially as described.

6. The combination with a furnace front plate, of a dead plate formedwith a recesss C opposite the fire door opening a metal fire doorDhavingitslower portion bentinwardly so as to form an extension E adaptedto close 20 the said recess when the door is in its closed position,balance weights secured to said door,

brackets secured to said front plate and

